diff mbox series

[10/14] bpf: Only sys admin can set no charge flag for bpf prog

Message ID 20220319173036.23352-11-laoar.shao@gmail.com
State New
Headers show
Series [01/14] bpf: Introduce no charge flag for bpf map | expand

Commit Message

Yafang Shao March 19, 2022, 5:30 p.m. UTC 
When a bpf prog is loaded by a proccess running in a container (with memcg),
only sys admin has privilege not to charge bpf prog memory into this
container while account it to root memcg only.

Signed-off-by: Yafang Shao <laoar.shao@gmail.com>
---
 kernel/bpf/syscall.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 346f3df9fa1d..ecc5de216f50 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2234,6 +2234,9 @@  static int bpf_prog_load(union bpf_attr *attr, bpfptr_t uattr)
 				 BPF_F_PROG_NO_CHARGE))
 		return -EINVAL;
 
+	if (attr->prog_flags & BPF_F_PROG_NO_CHARGE && !capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
 	if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
 	    (attr->prog_flags & BPF_F_ANY_ALIGNMENT) &&
 	    !bpf_capable())